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Jpn. J. Appl. Phys. 51 (2012) 010108 (9 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Selected Topics in Applied Physics

Centennial Anniversary of Superconductivity

Theory of Proximity Effect in Ferromagnet/Superconductor Heterostructures in the Presence of Spin Dependent Interfacial Phase Shift

Daisuke Yoshizaki, Alexander A. Golubov1, Yukio Tanaka1, and Yasuhiro Asano2

Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
1Faculty of Science and Technology and MESA+ Institute of Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands
2Department of Applied Physics, Center for Topological Science and Technology, Hokkaido University, Sapporo 060-8628, Japan

(Received June 13, 2011; accepted July 18, 2011; published online December 12, 2011)

We study the proximity effect and charge transport in ferromagnet (F)/superconductor (S) and S/F/I/F/S junctions (where I is insulator) by taking into account simultaneously exchange field in F and spin-dependent interfacial phase shifts (SDIPS) at the F/S interface. We solve the Usadel equations using extended Kupriyanov–Lukichev boundary conditions which include SDIPS, where spin-independent part of tunneling conductance GT and spin-dependent one Gφ coexist. The resulting local density of states (LDOS) in a ferromagnet depends both on the exchange energy Eex and Gφ/GT. We show that the magnitude of zero-temperature gap and the height of zero-energy LDOS have a non-monotonic dependence on Gφ/GT. We also calculate Josephson current in S/F/I/F/S junctions and show that crossover from 0-state to π.

URL: http://jjap.jsap.jp/link?JJAP/51/010108/
DOI: 10.1143/JJAP.51.010108


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